[R] Question about survdiff in for-loop.

Sando chocosando at daum.net
Fri Oct 19 09:02:05 CEST 2012

Hi everyone!!

I have dataset composed of a numbers of survival analyses. 
( for batch survival analyses by using for-loop) . 
Here are code !!

Num<-Num_t[2]   # These are predictors !!


for (i in 1:Num  )
survdiff(Surv(survival.m, survival) ~ names[i], data=svsv)
fit.Group<-survfit(Surv(survival.m, survival) ~ names[i] , data=svsv)
plot(fit.Group, col=2:1, xlab="Survival", ylab="Prob")


names[i] is not working in the survdiff. 
According to help R , the predictor must be single subset. 

And, names[i] is also single character, I think. 

But, it do NOT work. 

How I can solve this problem ? 

Thank you. 


View this message in context: http://r.789695.n4.nabble.com/Question-about-survdiff-in-for-loop-tp4646707.html
Sent from the R help mailing list archive at Nabble.com.

More information about the R-help mailing list